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If [math]A [/math] is a set, then [math]x A [/math] means [math]x [/math] "is in" [math]A [/math], or [math]x [/math] "is an element of" [math]A [/math].

Similarly, [math]x \href{/cs2800/wiki/index.php/%E2%88%89}{∉} A [/math] means [math]x [/math] is not in [math]A [/math].

The LaTeX symbols are \in and \notin.

See Set for more information.